Detection device

Abstract

According to an aspect, a detection device includes: an optical sensor including photodetection elements; an object placement member having a light-transmitting property and configured such that objects to be detected are placed thereon; and a control circuit. The optical sensor is configured to acquire image data at intervals of a predetermined period. The control circuit is configured to: extract a first outline of at least one region from first image data, calculate first coordinates corresponding to the first outline, and label the first coordinates with first identification information; extract a second outline of at least one region from second image data, calculate second coordinates corresponding to the second outline not containing the first coordinates, and newly add second identification information corresponding to the second outline not containing the first coordinates; and calculate a total number of pieces of the first identification information and the second identification information.

What is claimed is: 
     
         1 . A detection device comprising:
 an optical sensor comprising a plurality of photodetection elements arranged in a planar configuration;   an object placement member having a light-transmitting property, placed so as to overlap the optical sensor, and configured such that a plurality of objects to be detected are placed thereon; and   a control circuit configured to control the optical sensor, wherein   the optical sensor is configured to acquire image data at intervals of a predetermined period from start of measurement,   the control circuit is configured to:
 perform predetermined processing on each of a plurality of pieces of the image data; 
 extract a first outline of at least one region exceeding a predetermined threshold from first image data acquired in a first period, calculate first coordinates corresponding to the first outline, and label the first coordinates with first identification information corresponding to the first coordinates; 
 extract a second outline of at least one region exceeding the predetermined threshold from second image data acquired in a second period after elapse of the predetermined period since the first period, calculate, when the at least one extracted second outline includes a second outline that does not contain the first coordinates, second coordinates corresponding to the second outline that does not contain the first coordinates, and newly add, to the second coordinates, second identification information corresponding to the second outline that does not contain the first coordinates; and 
 calculate a total number of pieces of the first identification information used for labeling in the first image data and the second identification information newly used for labeling in the second image data. 
   
     
     
         2 . The detection device according to  claim 1 , wherein, when the at least one second outline extracted in the second image data includes a second outline containing the first coordinates corresponding to the first outline extracted in the first image data, the first coordinates and the first identification information corresponding to the first coordinates are associated with the second outline that contains the first coordinates. 
     
     
         3 . The detection device according to  claim 1 , wherein the control circuit is configured to generate an output image by superimposing, on the second image data, the extracted second outline and the second coordinates or the first coordinates corresponding to the second outline, and cause a display device to display the output image. 
     
     
         4 . The detection device according to  claim 3 , wherein the second outline is displayed in the output image with a line having a color or a color intensity different from that of a region surrounded by the second outline. 
     
     
         5 . The detection device according to  claim 1 , wherein the control circuit is configured to calculate an area of a region surrounded by the second outline. 
     
     
         6 . The detection device according to  claim 1 , comprising a light directivity control element disposed between the photodetection elements and the object placement member. 
     
     
         7 . The detection device according to  claim 6 , wherein the light directivity control element is a louver, a collimator, or microlenses. 
     
     
         8 . The detection device according to  claim 1 , comprising a light source configured to emit light to the photodetection elements.